Product Description
The 0 242 236 688 is engineered with a heavy-duty nickel-center electrode and a large copper core. This design is crucial for older Bullet engines, as it allows for efficient heat transfer, preventing the plug from fouling during slow city crawls or overheating during long highway thumps.
The WR7DC is a “Resistor” type plug (indicated by the ‘R’), which helps suppress electromagnetic interference—protecting the ignition coil and any electrical accessories you’ve added to your vintage machine. Its nickel-plated housing ensures that even after months of riding in the rain, the plug won’t seize in the cylinder head, making maintenance straightforward
Key Features:
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High Thermal Conductivity: The copper core center electrode enables rapid heat dissipation, vital for air-cooled vintage engines.
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Corrosion Protection: Nickel-plated threads and housing prevent the plug from “cold-welding” to the aluminum or iron head.
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Fouling Resistance: The insulator tip is designed to reach self-cleaning temperatures quickly, reducing carbon buildup during idling.
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Stable Spark Gap: Maintains a consistent 0.8mm gap for reliable starting and smooth low-end torque.
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Resistor Technology: Minimizes radio frequency interference and stabilizes the electrical load on the battery and coil.
Technical Specifications:
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Part Number: 0 242 236 688 (WR7DC)
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Brand: Bosch Genuine
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Thread Diameter: 14 mm
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Thread Reach: 19 mm (Long Reach)
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Hex Size: 21 mm (13/16″)
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Electrode Material: Nickel-Copper
Vehicle Compatibility:
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Royal Enfield Bullet 350 Standard (Old Cast Iron Engine / G2)
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Royal Enfield Bullet 500 (Old Cast Iron / Export Models)
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Royal Enfield Machismo 350/500 (AVL Engine)
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Royal Enfield Thunderbird 350 (Old AVL Engine)
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Note: This is NOT for the Twinspark UCE engines (Classic 350/500). For UCE models, use the WR8DC (Main) and UR4AC (Secondary).










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